Hoeveel gram opgeloste stof moet je afwegen om 250 ml KMnO4-oplossing te bereiden met een concentratie van 0,500 mol / L

How many grams of solute do you have to weigh to prepare 250 ml KMnO4 solution with a concentration of 0.500 mol / L

19.75g

Explanation:

Given parameters:

Volume of KMnO₄  = 250mL or 0.25L

Concentration of solution  = 0.5mol/L

Unknown:

Mass of solute or  KMnO₄ = ?

Solution:

To solve this problem, we need to find the number of moles first.

 Number of moles  = Concentration  x volume

 Number of moles  = 0.5mol/L x 0.25L  = 0.125mol

So;

   Mass in grams  = number of moles x molar mass

 Molar mass of  KMnO₄ = 39 + 55 + 4(16)  = 158g/mol

   Mass in grams  = 0.125 x 158  = 19.75g

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Explanation:

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

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